The material used in solar cells contains
1). Tin
2). Silicon
3). Caesium
4). Thallium
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1. Which one of the following is used for dating very old objects of archaeological importance?
2. Greenhouse effect is caused by
3. What causes the mottling of the dental enamel ?
4. The most abundant constituent of atmospheric air is
5. Which of the following elements has the lowest melting point?
6. In addition to hydrogen the other abundant element present on Suns surface is
9. Which variety of coal contains recognizable traces of the original plant material ?
10. Which one of the following is extensively used for sterilizing water ?